Sh2-88 A and B with LBN 137 - 139
Sh2-88 A and B with LBN 137 - 139
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MOUSE-OVER
IMAGE FOR STARLESS VIEW CLICK
ON IMAGE FOR FULL SIZE VIEW (6400x4368) Scope:
Celestron 9.25 Edge HD 235 mm at f/7;
Location: DAA Observatory, Shelter Valley, CA;
Dates: 5, 6, 12, 13, 28 June, 2024; Camera: ASI294MM (Baader
Ha OIII, RGB Filters) Exposure:
Ha 104 x 3.5 minutes (gain-200 2x2), OIII 104 x 3.5 minutes (gain-200 2x2), RGB -
32 each x 1.5 minutes -
(gain-121 2x2).
Processing: Data
Collection - N.I.N.A. (as FITs). Sub-frame calibration - Pixinsight
(WBPP). Sub-frame registration and integration (Average combine -
Linear fit clipping, 2X drizzle for Ha, OIII) - PixInsight (WBPP).
Noise reduction - NoiseXTerminator (RGB, Ha, OIII) - PixInsight. Non-linear stretching for
HA, OIII -
PixInsight. RGB combine and stretching, Photometric RGB calibration (SPCC)
- PixInsight. De-convolution - BlurXTerminator (AI4) - PixInsight.
Generation of starless Ha, OIII, and RGB image for later processing -
StarXTerminator (PixInsight). RGB stars (lower stretch) for star size control - PixInsight.
Ha and OIII starless combined in HOO starless image - Pixinsight. HOO
starless screened into RGB starless (with HOO brightness mask) -
PixInsight. RGB stars screened into final HOO-RGB starless image -
Affinity Photo. Final finishing -
Affinity Photo. Annotation - PixInsight, Aladin (Simbad), and Affinity
Photo. This image is an Narrow Band Broad Band HOO and RGB image with
Narrow Band emphasis. Image processed at 8288x5644
resolution (2x drizzle stacks). Full Field image size is approximately 6400x4368.
North is to the upper left in
this image. The large dominant nebula was cataloged in Lynds (LBN) and
Sharpless (Sh2) catalogs from visual wavelength image plates. The region was
later studied in IR wavelengths and determined to have star birth in the
structure and surrounding area. The is image also shows small bright nebulae in
the lower part of the image; One received the designation of Sh2-88 B.
(later determined to be two distinct structures B1, B2). The designation Sh2-88
A has conflicting location data in astronomy references - either to the
main diffuse nebula, the small bright nebula adjacent to B1 / B2. or a
third structure off this image field. The structures in this image are estimated
to be about 6,500 light years distant.
The
three small, bright nebulae on the bottom of the image are also LBN 138
(also Sh2-88 B1/B2), LBN 137, and Milky Way Project MWP1 G061431+001217
(also sometimes Sh2-88 A). The latter also known as an IR Bubble, but
has visible wavelength light as evidenced in this image. The large
Sh2-88 is also coincident with LBN 139. There are cataloged dark nebulae
(Dobashi 2066 and 2070) in this image as well Sh2-88 is an emission
line structure. Three ionizing stars have been identified and are
indicated in the annotated
image (with bright star symbols).
These objects, information, and some of the brighter
stars are identified in the annotated
image.
The Horizontal Full FOV is approximately 0.66 degrees. Full size, full field image scale is approximately
0.37 arcsec/pix.
Image
center approximately - Equatorial 2000: RA: 19h 45m 59s Dec: +25°17'23"
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